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Business Acquisition Business Acquisition Pro Forma (Details) (DelStar [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
DelStar [Member]
 
Business Acquisition [Line Items]  
Business Acquisition, Pro Forma Revenue $ 212.0us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax $ 23.9us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= swm_DelStarMember